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247
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NASA Technical Reports Server (NTRS)
926
ENERGY CONVERSION EFFICIENCY
703
SOLAR ENERGY CONVERSION
643
ENERGY CONVERSION
632
SOLAR CELLS
534
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2,397
NASA Network Resource and Training Site
343
American Libraries
296
Community Audio
260
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217
NASA Technical Documents
216
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2,397
nasa technical reports server (ntrs)
121
defense technical information center
79
eric
25
baxter, richard, 1615-1691
23
non
14
alleine, joseph, 1634-1668
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3,902
English
107
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